<template>
    <div>
     <!-- 面包屑导航 -->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区 -->
    <el-card>
        <el-alert
            title="注意：只允许为第三级分类设置相关参数！"
            type="warning" :closable="false" show-icon>
        </el-alert>
        <!-- 选中商品分类区 -->
        <el-row>
            <el-col class="cat_opt">
                <span>选择商品分类：</span>
                <!-- 商品分类级联选择框 -->
                <el-cascader
                    v-model="selectedCatekeys"
                    :options="catelist"
                    :props="cateProps"
                    @change="handleChange"
                    clearable filterable>
                </el-cascader>
            </el-col>
        </el-row>
        <!-- Tab页签区 -->
        <el-tabs v-model="activeName" @tab-click="handleTabClick">
            <el-tab-pane label="动态参数" name="many">
                <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
                <!-- 动态参数表格 -->
                <el-table :data="manyTableData" border stripe>
                    <!-- 展开行 -->
                    <el-table-column type="expand" label="~">
                        <el-table-column type="expand" label="~">
                            <template slot-scope="scope">
                                <!-- 循环渲染tag -->
                                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="deleteItem(i,scope.row)">{{item}}</el-tag>
                                <!-- 按钮输入框 -->
                                <el-input
                                    class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)"
                                >
                                </el-input>
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">新增参数</el-button>
                            </template>
                        </el-table-column>
                    </el-table-column>
                    <!-- 索引列 -->
                    <el-table-column type="index" label="#"></el-table-column>
                    <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作">
                        <template slot-scope="scope">
                            <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                            <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
            </el-tab-pane>
            <el-tab-pane label="静态属性" name="only">
                <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
                    <!-- 静态参数表 -->
                    <el-table :data="onlyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand" label="~">
                            <template slot-scope="scope">
                                <!-- 循环渲染tag -->
                                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="deleteItem(i,scope.row)">{{item}}</el-tag>
                                <!-- 按钮输入框 -->
                                <el-input
                                    class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)"
                                >
                                </el-input>
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">新增属性</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index" label="#"></el-table-column>
                        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
            </el-tab-pane>
        </el-tabs>
    </el-card>
    <!-- 添加参数对话框 -->
    <el-dialog
        :title="'添加'+titleText"
        :visible.sync="addDialogVisible"
        width="50%"
        @closed="addDialogClosed">
        <el-form :model="addForm" :rules="formRules" ref="addFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="addForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="addDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addParams">确 定</el-button>
        </span>
    </el-dialog>
    <!-- 修改参数对话框 -->
    <el-dialog
        :title="'修改'+titleText"
        :visible.sync="editDialogVisible"
        width="50%"
        @closed="editDialogClosed">
        <el-form :model="editForm" :rules="formRules" ref="editFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="editForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="editDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="editParams">确 定</el-button>
        </span>
    </el-dialog>
    </div>
</template>

<script>
    export default {
        data() {
            return {
                // 商品分类列表
                catelist:[],
                // 级联选择框的配置对象
                cateProps:{
                    value:'cat_id',
                    label:'cat_name',
                    children:'children',
                    expandTrigger:'hover',
                },
                // 级联选择框双向绑定数组
                selectedCatekeys:[],
                // 被激活的页签名称
                activeName:'many',
                //动态面板数据
                manyTableData:[],
                //静态面板数据
                onlyTableData:[],
                // 控制对话框的显示与隐藏
                addDialogVisible:false,
                // 添加参数的表单对象
                addForm:{
                    attr_name:''
                },
                // 表单验证规则
                formRules:{
                    attr_name:[
                        { required: true, message: '请输入参数名称', trigger: 'blur' },
                        { min: 2, max: 12, message: '长度在 2 到 12 个字符', trigger: 'blur' }
                    ]
                },
                // 控制修改对话框的显示
                editDialogVisible:false,
                // 修改的表单数据对象
                editForm:{},
            }
        },
        created() {
            this.getCateList()
        },
        methods: {
            // 获取所有商品分类
            async getCateList(){
                let {data:res} = await this.$http.get('categories')
                if(res.meta.status!=200) return this.$message .error('获取商品分类失败！')
                this.catelist=res.data
            },
            // 级联选择框选中会发生变化
            handleChange(){
                this.getParamsData()
            },
            // 获取参数的列表数据，主要处理无论切换经动态面板都会根据级联发起请求问题
            async getParamsData(){
                // 此处只能选择第三级分类，判断selectedCatekeys数组长度是否为3
                if(this.selectedCatekeys.length!=3){
                    this.selectedCatekeys=this.manyTableData=this.onlyTableData=[]
                    return false
                }else{
                    // 根据所选分类的id和当前所处的面板获取对应的参数
                    let {data:res}= await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:this.activeName}})
                    if(res.meta.status!=200) return this.$message.error('获取参数列表失败！')
                        // 遍历存入数组，作为展开行添加的tag
                    console.log('获取到的数据',res.data)
                    res.data.forEach(item=>{
                        item.attr_vals=item.attr_vals?item.attr_vals.split(' '):[]
                        // 控制按钮输入框的显示与隐藏
                        item.inputVisible=false
                        item.inputValue=''
                    })
                    
                    // 判断：动静态面板数据分开存放
                    if(this.activeName=='many'){ //动态
                        this.manyTableData=res.data
                    }
                    else{ //静态
                        this.onlyTableData=res.data
                    }
                }
            },
            // tab页签点击事件处理函数
            handleTabClick(){
                this.getParamsData()
            },
            // 监听添加对话框的关闭事件
            addDialogClosed(){
                this.$refs.addFormRef.resetFields()
            },
            editDialogClosed(){
                this.$refs.editFormRef.resetFields()
            },
            // 点击对话框按钮添加参数
            addParams(){
                this.$refs.addFormRef.validate(async val=>{
                    if(!val) return
                    let {data:res} = await this.$http.post(`categories/${this.cateId}/attributes`,{
                        attr_name:this.addForm.attr_name,
                        attr_sel:this.activeName
                    })
                    if(res.meta.status!=201) return this.$message.error('添加参数失败！')
                    this.$message.success('添加参数成功！')
                    this.addDialogVisible=false
                    this.getParamsData()
                })
            },
            // 点击编辑按钮，展示对话框
            async showEditDialog(id){
                let {data:res} = await this.$http.get(`categories/${this.cateId}/attributes/${id}`,{params:{attr_sel:this.activeName}})
                if(res.meta.status!=200) return this.$message.error('获取参数信息失败！')
                this.editForm=res.data
                this.editDialogVisible=true
            },
            // 点击按钮修改参数信息
            editParams(){
                this.$refs.editFormRef.validate(async val=>{
                    if(!val) return
                    let {data:res}=await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
                        attr_name:this.editForm.attr_name,
                        attr_sel:this.activeName
                    })
                    if(res.meta.status!=200) return this.$message.error('修改参数失败！')
                    this.$message.success('修改参数成功！')
                    this.getParamsData()
                    this.editDialogVisible=false
                })
            },
            // 根据id删除参数
            async removeParams(id){
                let confirmRes=await this.$confirm('是否删除该参数?', '提示', {
                    confirmButtonText: '确定',
                    cancelButtonText: '取消',
                    type: 'warning'
                }).catch(err=>err)
                if(confirmRes=='confirm'){
                    let {data:res}=await this.$http.delete(`categories/${this.cateId}/attributes/${id}`)
                    if(res.meta.status!=200) return this.$message.error('删除参数失败！')
                    this.$message.success('删除参数成功！')
                    this.getParamsData()
                }
            },
            // 按钮输入框失去焦点或者按下enter键
            async handleInputConfirm(row){
                // 判断是否输入内容
                if(row.inputValue.trim().length==0){
                    this.$message.warning('未输入内容！')
                }
                else{
                    row.attr_vals.push(row.inputValue.trim())
                    this.saveAttrVals(row)
                }
                row.inputValue=''
                row.inputVisible=false
            },
            // 操作编辑和按钮
            async saveAttrVals(row){
                console.log('最后一步获得的值',row.attr_vals)
                // 清除掉空数组
                let valsArr=[]
                row.attr_vals.forEach(item=>{
                    if(item){
                        valsArr.push(item)
                    }
                })
                // return false
                row.attr_vals.push(row.inputValue.trim())
                    let {data:res}=await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
                        attr_name:row.attr_name,
                        attr_sel:row.attr_sel,
                        attr_vals:valsArr.join(' ')
                    })
                    if(res.meta.status!=200) return this.$message.error('修改参数失败！')
                    this.$message.success('修改参数成功！')
                    this.getParamsData()
            },
            // 展示按钮输入框
            showInput(row){
                row.inputVisible=true
                /* 点击时自动获取焦点
                    $nextTick 当页面上的元素被重新渲染后才会执行回调中的代码
                
                */
                this.$nextTick(_ => {
                    this.$refs.saveTagInput.$refs.input.focus();
                });
            },
            // 删除对应的参数可选项
            async deleteItem(i,row){
                let confirmRes=await this.$confirm('是否删除该参数', '提示', {
                    confirmButtonText: '确定',
                    cancelButtonText: '取消',
                    type: 'warning'
                })
                .catch(err=>err)
                if(confirmRes=='confirm'){
                    row.attr_vals.splice(i,1)
                    this.saveAttrVals(row)
                }
            },
        },
        computed: {
            // 如果按钮被禁用，返回true
            isBtnDisabled(){
                if(this.selectedCatekeys.length!=3){
                    return true
                }else{
                   return false 
                }
            },
            // 当前选中的三级分类的id
            cateId(){
                if(this.selectedCatekeys.length==3){
                    return this.selectedCatekeys[2]
                }else{
                    return null
                }
            },  
            // 动态计算dialog标题
            titleText(){
                if(this.activeName=='many'){
                    return '动态参数'
                }else{
                    return '静态属性'
                }
            }, 
        },
    }
</script>

<style scoped>
    .cat_opt{margin: 15px 0;}
    /* tag标签 */
    .el-tag{margin: 0 8px;}
    /* 按钮文本输入框 */
    .input-new-tag{
        width: 120px;
    }
</style>